Rotor spindle driving part in a spinning machine

ABSTRACT

Rotors in a spinning machine, where individual fibres are collected and then withdrawn as a twisted yarn, are driven through spindles connected at one ends to the corresponding ones and pulleys connected to the other ends of the spindles by a belt. During driving of the belt, the frictional heat is produced and accumulated in the pulleys. According to the invention, the pulleys are made of a material having a lower heat conductivity than that of the spindles to prevent the accumulated heat from being transferred to bearings which support the associated spindles for rotation.

United States Patent 1 Watanabe et al.

ROTOR SPINDLE DRIVING PART IN A SPINNING MACHINE Inventors: EtsujiWatanabe; Tsutomu Miyazaki, both of Kariya; Takashi Kato, Toyota;Noriaki Miyamoto, Kariya, all of Japan Assignees: Kabushiki KaishaToyoda Jidoshokki Seisakusho, Kariya; Daiwa Boseki Kabushiki Kaisha,Osaka, both of Japan; part interest to each Y Filed: Oct. 23, 1974 Appl.No.: 5 17,435

Foreign Application Priority Data Oct. 31, 1973 Japan 48-126022[U] U.S.Cl. 57/5839 Int. Cl. D0lI-I 41/12 Field of Search 55/58.89-58.95, 9O

[ Dec. 2, 1975 [56] References Cited UNITED STATES PATENTS 3,375,6494/l968 Burs et al 57/58.9l 3,51 I045 5/1970 Burs et al r r v 57/58.9l3,756,007 9/1973 Bartling 57/5895 X 3.815.348 6/1974 Wachendorf ct alt57/5889 Primary Examiner-Donald E. Watkins Attorney, Agent, orFirm-Wenderoth, Lind & Ponack [5 7] ABSTRACT Rotors in a spinningmachine, where individual fibres are collected and then withdrawn as atwisted yarn are driven through'spindles connected at one ends to thecorresponding ones and pulleys connected to the other ends of thespindles by a belt. During driving of the belt, the frictional heat isproduced and accumulated in the pulleys. According to the invention, thepulleys are made of a material having a lower heat conductivity thanthat of the spindles to prevent the accumulated heat from beingtransferred to bearings which support-the associated spindles forrotation.

5 Claims, 3 Drawing Figures US. Patent Dec. 2, 1975 ROTOR SPINDLEDRIVING PART IN A SPINNING MACHINE BACKGROUND OF THE INVENTION Thisinvention relates to improvements in rotor spindle driving parts in aspinning machine.

In each spinning unit of the open end spinning machine, a continuouslydelivered sliver is separated into individual fibres by means of aseparator and the individual fibres aretransported to the inner wall ofa rotor where they are collected and then withdrawn as a twisted yarn.The rotor is driven. through a spindle and a pulley by a belt which isin frictional engagement with the pulley, the spindle being connected atone end to the rotor and at the other end to the pulley .and carried forrotation by a bearing(s The opening of the rotor is arranged around theseparator so as to provide an annular narrow clearance between the outerwall of the separator and the wall of the rotor opening. In addition, astationary holder for the rotor has an opening which is arranged aroundthe separator and very'close to the rotor opening, thus also providing anarrow clearance defined by the holder, separator and rotor. Thus, theclearances have the possibility of being clogged by the fibres. If thisoccurs, the rotor will become decreased in speed or completely stoppedin spite of the belt being driven, resulting in the generation of heatat the interface between the pulley and the belt, The heat thus producedwill be transferred through the spindle to the spindle bearing(s) whichis subject to unfavorable effects. That is, the heat transferred to thebearing excessively increases the temperature of the lubricant, such asgrease, contained within the bearing, with the resultant disadvantagethat the specific quality of the lubricant becomes poor. Furthermore,where structural elements, e.g. a ball retainer and a seal plate,comprising the bearing are made of plastics, their property is madeworse by means of the high temperature transferred thereto and in theworst case they become fused and/or deformed.

Particularly, the above-mentioned disadvantages often arise whenapplying the brake on the pulley of the high speed open end spinningmachine to suddenly stop the rotor, since at this time the pulley becometemporarily greatly increased in its temperature. It has been thereforedesired to make improvements in the open end spinning machine toeliminate the aforesaid disadvantages.

SUMMARY OF THE INVENTION This invention relates to an open end spinningmachine where each rotor is adapted to be driven through a spindle and apulley connected to one end of the spindle remote from the rotor by abelt and has for its object the provision of an improved belt drivenpulley which does not allow the heat produced therein to affect aspindle hearing or bearings.

According to the invention, the aforesaid disadvantages can beeliminated by providing a belt driven pulley or a part directly drivenby the belt, which pulley or part is made of a material having a lowerheat conductivity than that of the spindle, whereby the heat produced atthe interface between the belt and the pulley or part is hard to betransferred to the spindle bearing.

BRIEF DESCRIPTION or HE DRAWING The invention will become more readilyapparent from the following exemplary description in connection with theaccompanying drawing in which:

FIG. 1 is a side elevational view, partially in section, illustrating.one spinning unit of an open end spinning machine incorporated with theinvention;

FIG. 2 is a side elevation of the spinning unit of FIG. 1 in aninoperative position; and

FIG. 3 is a fragmental diagrammatic view illustrating a differentmodification of the invention.

DESCRIPTION oE THE EMBODIMENTS Referring now to the drawing, wherin likereference characters designate like or corresponding parts throughoutthe views, there is ,shown in FIGS. 1 and 2 a spinning unit of an openend spinning machine incor porated with the invention, which com'prisesa series of spinning units although in the figures a single spinningunit is illustrated only for the purpose of simplification. Each of thespinning units includes feeding and coming means 23 (shown in FIG. 1 bythe dotted line) for feeding a not shown sliver through an inlet channel24 into a rotary spinning chamber defined by a rotor l. A finished yarn26 is withdrawn through a discharge channel 25 provided in a separator21. A hunger 3 fixedly secured to a mounting plate 2 carries, through apin 4, a rotor holder 5 for pivotal motion. Connected to the rotorholder 5 by means of a screw 20 is a bearing 6 for rotatably carrying aspindle S which has the rotor 1 and a pulley 8 connected to the oppositeends thereof, the pulley8 being in conventional, frictional engagementwith a belt 7'. Therefore, in highspeed travelling of the belt 7, thepulley 8 is rotated thereby and hence the rotor 1 also rotated at highspeed to perform the spinning of fibres. The separator 21 partly entersthe rotor 1 through an opening 22 thereof so as to provide an annularnarrow clearance between the inner wall of the rotor l and the wallofthe separator 21. In addition, the stationary holder5 for the rotor 1has an opening which is arranged around the separator and very close tothe rotor opening 22, thus also providing a narrow clearance defined bythe holder 5, separator 21 androtor 1. Therefore, it is understood thatthese clearances have the possibility of being clogged by the fibresduring the spinning operation.

The bearing 6 may contain a suitable lubricant, such as greace, and someor all components thereof may be made of suitable plastics.

For example, upon the occurrence of the sliver breakage, the rotation ofthe rotor has to be stopped in order to clean the interior or spinningchamber of the rotor. For the purpose of doing so, in the spinningmachine of the type described, a pin 9 is pushed down to disengage acatcher 10 therefrom to thereby allow a spinning body 11 to incline on apin 12 in a counterclockwise direction in FIG. 1. At the same time, abridge plate 14 mounted for pivotal motion on the spinning body 11 bymeans of a pin 27 is moved until its hook extremity 28 is brought intoengagement with a flange 13 of the rotor holder 5, whereupon the holder5 is inclined on the pin 4 as shown in FIG. 2. At this time, the pulley8 is also inclined to be disengaged from the belt 7 and forced against abrake shoe 15 mounted on a brake member 16, whereby the brake is appliedon the rotor 1, resulting in the stoppage of the latter. Thus, it isunderstood that the frictional heat is produced at 3 the interfacebetween the belt 7 and the pulley 8 and stored in the pulley 8.

In order to make it hard to transfer the stored heat to the spindlebearing 6, the pulley 8 is made of a material, such as stainless steelcontaining l8% chrome and 8% nickle and of 14 KcallmhC heatconductivity, having a lower heat conductivity than that of the spindlematerial which is normally carbon steel of 46 Kcal/mhC heatconductivity. Since it is comparatively difficult to machine thestainless steel material into a desired shape, only the pulley or a partdirectly driven by the belt 7 is preferably made of the stainless steel.

The results of the tests are listed in the Table 1, wherein in the caseof the prior art the material of both the pulley and the spindle iscarbon steel containing below 0.5% carbon and of 46 Kcal/mhC heatconductivity; and in the case of the present invention only the pulleyis made of stainless steel containing 18% chrome and 8% nickle and of 14KcallmhC heat conductivity.

Thus, it is noted from the Table that the heat produced by the frictionbetween the belt and the pulley is hard tovbe transferred to the spindleand therefore to the bearing. The lubricant, such as grease, within thebearing is prevented from being worsened and the effective life of thecomponents comprising the bearing can be prolonged, since the bearing isnot excessively heated even when applying the brake on the pulley. Inaddition, the prevention of deterioration of the bearing lubricant isfollowed by an advantage of lengthening a cycle of replenishment of thelubricant.

In FIG. 3, the belt 7 is adapted to be in frictional engagement with apart 8 which is connected in end to end relationship with the spindle byfriction welding and made of stainless steel.

It is to be noted that although FlG. 1 illustrates a particular type ofspinning machine, that is a hinge open end spinning machine, theinvention is not limited thereby.

Also, it is to be noted that the particular embodiments of the inventiondescribed herein are merely illustrative of the underlying principlesinvolved, and numerous modifications may be conceived without departingfrom the spirit and scope of the invention. For example, the pulley maybe made of stainless steel containing 20% chrome and 15% nickel, or 25%chrome and 20% nickel; or nickel-chromium steel containing 40% nickeland 15% chrome, or nickel and 15% chrome; or nickel steel containing10%, 20%, 30%, 40%, or 50% nickel. The heat conductivity of thesematerials is within the range of 10 to 22 Kcal/mhC. The spindle may bemade of bearing steel, such as a high carbon-chromium steel, having aheat conductivity of 32 to 37 Kcal/mhC carburizing steel, or heatresisting steel.

What we claim is:

1. In a spinning machine comprising at least one spinning unit eachhaving a rotor, which defines a spinning chamber, a spindle connected atone end to said rotor, bearing means for supporting said spindle forrotation, a member connected to the other end of said spindle, saidmember being made of a material having a heat conductivity lower thanthat of said spindle, a belt travelling in frictional engagement withsaid member to thereby rotate the spinning chamber of said rotor toperform spinning operation.

2. A spinning unit according to claim 1, wherein said spindle is made ofcarbon steel while said member stainless steel.

3. A spinning unit according to claim 1, wherein said bearing meanscontains a lubricant therein.

4. A spinning unit according to claim 3, wherein some of componentscomprising said bearing means are made of plastics.

5. A spinning unit according to claim 1, comprising brake means mountedadjacent to said member to stop the rotation of said rotor, said memberengageable with either said belt for rotating said rotor or said brakemeajns for braking said rotor to the stop.

1. In a spinning machine comprising at least one spinning unit eachhaving a rotor, which defines a spinning chamber, a spindle connected atone end to said rotor, bearing means for supporting said spindle forrotation, a member connected to the other end of said spindle, saidmember being made of a material having a heat conductivity lower thanthat of said spindle, a belt travelling in frictional engagement withsaid member to thereby rotate the spinning chamber of said rotor toperform spinning operation.
 2. A spinning unit according to claim 1,wherein said spindle is made of carbon steel while said member stainlesssteel.
 3. A spinning unit according to claim 1, wherein said bearingmeans contains a lubricant therein.
 4. A spinning unit according toclaim 3, wherein some of components comprising said bearing means aremade of plastics.
 5. A spinning unit according to claim 1, comprisingbrake means mounted adjacent to said member to stop the rotation of saidrotor, said member engageable with either said belt for rotating saidrotor or said brake means for braking said rotor to the stop.